background images taken from http://hubblesite.org/

rocketship image taken from http://vignette1.wikia.nocookie.net/fallout/images/8/85/Icon_rocket_souvenir.png/revision/latest?cb=20111224232845

css does not validate because of the animation on this image, we decided it was worth some browsers not recognizing it to keep the animation

randomization of background images taken from 	http://www.hiveware.com/imagerotator.php